含混杂活性端基新型多官能团齐聚物的结构与性能

Structures and Properties of Novel Multifunctional Hybrid Oligomers

通过控制4,4'-二氨基二苯甲烷环氧树脂(TGDDM)和丙烯酸(AA)的摩尔比(1∶2)合成了化学共混的含混杂活性端基的多官能团齐聚物MVEO-2,直接将多官能团环氧树脂TGDDM与多官能团环氧乙烯基树脂MVER通过物理共混得到聚合物共混物MVEOmix.研究了化学共混和物理共混对含混杂活性端基多官能团齐聚物的结构、性能和形态的影响.红外光谱(FTIR)和核磁共振谱(1H NMR)表明,MVEO-2和MVEOmix具有相同的结构组成.凝胶渗透色谱(GPC)分析表明MVEOmix具有双峰结构且分子量分布较窄,而MVEO-2具有多峰结构且分子量分布较宽.热重分析(TGA)和动态热机械分析(DMA)表明,MVEO-2的热稳定性比MVEOmix更高.MVEO-2的强度和韧性比MVEOmix明显提高,弯曲强度提高17%,拉伸强度提高38%,断裂伸长率提高35%,冲击强度提高24%.扫描电镜结果表明化学共混形成了更均匀紧密的互穿聚合物网络结构.

Tetraglycidyl 4,4＇-diaminodiphenylmethane（TGDDM） was toughened by reactive blending and physical blending respectively with multifunctional vinyl ester resin（MVER）.Novel multifunctional hybrid oligomer（MVEO-2） containing two different reactive groups was synthesized through the esterfication of TGDDM with acrylic acid（AA） [n（TGDDM） / n（AA） = 1 ∶ 2] while MVEOmixwas obtained by physical blending TGDDM with MVER.The structures and properties of MVEO-2 and MVEOmixwere studied.FTIR and1 H NMR show that two oligomers have same structural components.It was found that MVEOmixpresented bimodal and narrow molecular weight distribution while MVEO-2 had multimodal and broad molecular weight distribution.MVEO-2 showed obvious improvement in thermal stability than MVEOmixfrom thermogravimetric analysis（TGA） and dynamic mechanical analysis（DMA） analysis.The strength and toughness of MVEO-2were improved than those of MVEOmix： flexural strength improved 17%,tensile strength improved 38%,elongation improved 35% and impact strength improved 24%.The excellent performance of MVEO-2 was attributed to the formation of close and even interpenetrating polymer network（IPN）,which was demonstrated by scanning electron microscope（SEM）.